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Numerical simulation is carried out to investigate the flow characteristics of two-dimensional laminar incompressible slot jet flows. Simulations are done for a vertical slot jet on a block at the bottom wall, and the top wall is confined by the parallel surface. The reattachment length, detachment length, vortex center and the coefficient of friction (C f ) are analyzed for different types of flow patterns. The correlation between the Reynolds number (Re) with vortex center and reattachment length is recommended. A detailed study is reported on the horizontal velocity profiles at various downstream locations by varying the aspect ratio (AR) (2 ≤ AR ≤ 5), block width (0.25 ≤ w/D h ≤ 1.75), block height (0.25 ≤ h/D h ≤ 1.0) and the jet exit Reynolds numbers (100 ≤ Re ≤ 300). The critical Reynolds number for the formation of the secondary vortex is obtained. The numerical results indicated that the C f value increases while decreasing the distance between the jet and the impingement block. It is found that the effects of AR and Re are more influencing on the fluid flow field, compared to the block width and the block height.Keywords Coefficient of friction · Laminar flow · Reattachment length · Reynolds number · Single slot jet · Vortex center List of symbolsAV Adjacent vortex AR Aspect ratio of the domain = (L y /W ) C f Skin friction coefficient L x Length of the computational domain in the X direction (m) L y Length of the computational domain in the Y direction (m) D h Hydraulic diameter of the jet (m) h Height of the block (m) h/D h Dimensionless block height w Width of the block (m) w/D h Dimensionless block width W Width of the jet (m) 123 8078 Arab J Sci Eng (2014) 39:8077-8098

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In the present numerical investigation, the flow field of confined slot air jet in a rectangular computational domain is reported. In the present work the flow field parameters like reattachment length, vortex center and horizontal velocity profiles for various Reynolds numbers and for various aspect ratios are presented .The present study reveals that the vortex centers are moving in a downstream direction with increase in Reynolds number. The reattachment length is directly dependent on the Reynolds numbers. In case of vortex dynamics, the vortex size is indirectly dependent on the inlet jet width. In the present investigation, SIMPLE algorithm is used to solve the governing equations. It is concluded that the aspect ratio and the Reynolds number are playing dominant roles in flow field of the present computational domain.